Author
Grzegorz Glinka
Other affiliations: Warsaw University of Technology, Aalto University, University College London
Bio: Grzegorz Glinka is an academic researcher from University of Waterloo. The author has contributed to research in topics: Stress concentration & Stress (mechanics). The author has an hindex of 30, co-authored 75 publications receiving 4083 citations. Previous affiliations of Grzegorz Glinka include Warsaw University of Technology & Aalto University.
Papers published on a yearly basis
Papers
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TL;DR: In this article, an energy-based method of local elastic-plastic stress and strain calculation is presented, where the theoretical stress concentration factor k t can be related to the unit elastic strain energy at a notch root.
418 citations
TL;DR: In this article, an energy-based method of calculating elastic-plastic strains and stresses near notches and cracks is presented, where the strain energy density in the plastic zone ahead of a notch can be calculated on the basis of the elastic stress-strain solution.
305 citations
TL;DR: In this article, a model for fatigue crack growth based on the elastic-plastic crack tip stress-strain history was proposed, and the model was developed to predict the effect of the mean stress including the influence of applied compressive stress.
300 citations
TL;DR: In this paper, an application of the equivalent strain energy density method for calculation of elastic-plastic notch-tip strain under cyclic loading is presented. But the energy density was not applied to the case of the plastic yielding around the notch tip.
287 citations
TL;DR: In this paper, a universal weight function expression with suitable reference stress intensity factors was used to derive the weight functions for internal and external radial cracks in a thick cylinder, and these weight functions were then further used to calculate the stress intensity factor for radial cracks.
276 citations
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31 Oct 2001
TL;DR: The American Society for Testing and Materials (ASTM) as mentioned in this paper is an independent organization devoted to the development of standards for testing and materials, and is a member of IEEE 802.11.
Abstract: The American Society for Testing and Materials (ASTM) is an independent organization devoted to the development of standards.
3,792 citations
TL;DR: A comprehensive review of cumulative fatigue damage theories for metals and their alloys, emphasizing the approaches developed between the early 1970s to the early 1990s, can be found in this paper, where the authors grouped these theories into six categories: linear damage rules, nonlinear damage curve and two-stage linearization approaches; life curve modification methods; approaches based on crack growth concepts; continuum damage mechanics models; and energy-based theories.
1,123 citations
TL;DR: In this article, the wind resources assessment models, site selection models and aerodynamic models including wake effect are reviewed and different performance and reliability evaluation models, various problems related to wind turbine components (blade, gearbox, generator and transformer) and grid for wind energy system have been discussed.
Abstract: Energy is an essential ingredient of socio-economic development and economic growth. Renewable energy sources like wind energy is indigenous and can help in reducing the dependency on fossil fuels. Wind is the indirect form of solar energy and is always being replenished by the sun. Wind is caused by differential heating of the earth's surface by the sun. It has been estimated that roughly 10 million MW of energy are continuously available in the earth's wind. Wind energy provides a variable and environmental friendly option and national energy security at a time when decreasing global reserves of fossil fuels threatens the long-term sustainability of global economy. This paper reviews the wind resources assessment models, site selection models and aerodynamic models including wake effect. The different existing performance and reliability evaluation models, various problems related to wind turbine components (blade, gearbox, generator and transformer) and grid for wind energy system have been discussed. This paper also reviews different techniques and loads for design, control systems and economics of wind energy conversion system.
908 citations
TL;DR: In this article, an energetic approach is proposed to predict the static and fatigue behavior of components weakened by sharp reentrant corners, where the energy in a small volume of material surrounding the notch tip has a finite value and such a value is thought of as the entity that controls the failure.
Abstract: The paper presents an energetic approach useful to predict of the static and fatigue behavior of components weakened by sharp re-entrant corners. Despite the fact that stresses and strain energy density tend toward infinity at the point of singularity, the energy in a small volume of material surrounding the notch tip has obviously a finite value and such a value is thought of as the entity that controls the failure. The energy, averaged in a volume of radius R (which depends on the material properties), is a precise function of the Notch Stress Intensity Factors and is given in closed form for plane stress and plane strain conditions, the material being thought of as isotropic and linear elastic. The method is validated taking into account experimental data already reported in the literature, concerning both static tests carried out on polymethyl metacrylate (PMMA)and Duraluminium specimens and fatigue tests on welded joints and notched components in structural steels. As a matter of fact, the method proposed here is the re-formulation, on one hand, of some recent area/volume criteria (in which averaged values of the maximum principal stress are used to predict component fatigue limits) and, on the other, of N-SIF-based criteria, where the Notch Stress Intensity Factors are thought of as the parameters that control static and fatigue failures.
722 citations
TL;DR: In this article, the origins of residual stress are understood, opportunities for removing harmful or introducing beneficial residual stresses recognized, their evolution in-service predicted, their influence on failure processes understood and safe structural integrity assessments made, so as to either remove the part prior to failure, or to take corrective action to extend life.
Abstract: Our safety, comfort and peace of mind are heavily dependent upon our capability to prevent, predict or postpone the failure of components and structures on the basis of sound physical principles While the external loadings acting on a material or component are clearly important, There are other contributory factors including unfavourable materials microstructure, pre-existing defects and residual stresses Residual stresses can add to, or subtract from, the applied stresses and so when unexpected failure occurs it is often because residual stresses have combined critically with the applied stresses, or because together with the presence of undetected defects they have dangerously lowered the applied stress at which failure will occur Consequently it is important that the origins of residual stress are understood, opportunities for removing harmful or introducing beneficial residual stresses recognized, their evolution in-service predicted, their influence on failure processes understood and safe structural integrity assessments made, so as to either remove the part prior to failure, or to take corrective action to extend life This paper reviews the progress in these aspects in the light of the basic failure mechanisms
595 citations